The Watcher

The Watcher is a mob that you should avoid. It normally spawns at night and near lava sources especially in the Nether.

It basically has a Warden - based behavior, but instead of immediately attacking when it spots you, it just watches your every move, waiting until it's the perfect time to attack.

If you want to defeat it, use mostly ranged tactics or any exploit.

You also have to know that the Watcher normally appears in groups, which basically could make a typical cave adventure into a stealth game.

This mob was basically made in order for Minecraft Bedrock to have it's own Cave Dweller, like the thousands of them that already exist.